New rock diffuse image

This is an alternative rock image for the the terrain texures. To use it simply copy the rock_diffuse and drop it in your map texture terrain folder. BE SURE TO KEEP THE ORIGINAL rock diffuse just in case you do not likethe change or if something should happen to go wrong. I hope you mappers will enjoy this. Also for the less experienced you will not have to restart your game for the new texture to show up.